关键词: 陕西, 木本植物, 区系研究, 区系特征

Abstract: Shaanxi is situated in the region that connects loess plateau and Qingling Bashan mountain. Here grow various woody plants, summing into 1260 species (in cluding infraspecific taxon) that belong to 101 families and 324 genera, of which there are 27 Chinese endemic genera (not induding cultivated plants) and 25 Shaanxi endem ic taxa. Based on the analysis of the dominant geographical elements of the flora, the paper has discussed the major characteristics of the flora as follows:1. rich species;2. origining anciently; 3. striking differences befween N. Shaanxi and S. Shaanxi;4. a number of Shaanxi endemic woody plants; 5. assembling rare and endengered woody plants. Finally, It is believed that the flora in Shaanxi connects wildly with other geographic elements of the world flora and that temperate floristic elements play dominant role in this place; that there are the transition characteristics from north to south and from east to west in Shaanxi flora; that there are a lot of relic tertiary plant,Chinese endemic plants and Shaanxi endemic taxon.

Key words: Shaanxi, Woody plants, Floristic study, Characte ristics of the flora